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Posted 11 Oct 2013

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11 Oct 2013CPOL4 min read
Different forums are filled with the questions regarding how to manually implement cookies for login or in other words how to implement "Remeber me"

This articles was originally at wiki.asp.net but has now been given a new home on CodeProject. Editing rights for this article has been set at Bronze or above, so please go in and edit and update this article to keep it fresh and relevant.

Different forums are filled with the questions regarding how to manually implement cookies for login or in other words how to implement "Remeber me" option.

Following is the code that will give the idea of how to achieve this task.

Controls used
1. TextBox, ID = TbUserName
2. TextBox, ID = TbPassword
3. CheckBox, ID = CbRememberMe
4. Button, ID = BtLogin
5. LinkButton, ID = lbSignout

------------------If you are using VB.Net-------------------------

Partial Class _Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not IsPostBack Then
            'Check if the browser support cookies
            If Request.Browser.Cookies Then
               'Check if the cookies with name PBLOGIN exist on user's machine
                If Request.Cookies("PBLOGIN") IsNot Nothing Then
                    'Pass the user name and password to the VerifyLogin method
                    Me.VerifyLogin(Request.Cookies("PBLOGIN")("UNAME").ToString(), Request.Cookies("PBLOGIN")("UPASS").ToString())
                End If
            End If
        End If
    End Sub

    Protected Sub BtLogin_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        'check if remember me checkbox is checked on login
        If (Me.CbRememberMe.Checked) Then
            'Check if the browser support cookies
            If (Request.Browser.Cookies) Then
                'Check if the cookie with name PBLOGIN exist on user's machine
                If (Request.Cookies("PBLOGIN") Is Nothing) Then
                    'Create a cookie with expiry of 30 days
                    Response.Cookies("PBLOGIN").Expires = DateTime.Now.AddDays(30)
                    'Write username to the cookie
                    Response.Cookies("PBLOGIN").Item("UNAME") = Me.TbUserName.Text
                    'Write password to the cookie
                    Response.Cookies("PBLOGIN").Item("UPASS") = Me.TbPassword.Text
  'If the cookie already exist then wirte the user name and password on the cookie
                Else
                    Response.Cookies("PBLOGIN").Item("UNAME") = Me.TbUserName.Text
                    Response.Cookies("PBLOGIN").Item("UPASS") = Me.TbPassword.Text
                End If
            End If
        End If

        Me.VerifyLogin(Me.TbUserName.Text, Me.TbPassword.Text)
    End Sub

    Protected Sub VerifyLogin(ByVal UserName As String, ByVal Password As String)
        Try
            'If login credentials are correct
                 'Redirect to the user page
            'else
                 'prompt user for invalid password
            'end if
        Catch ex as System.Exception
            Response.Write(ex.Message)
        End Try
    End Sub

    Protected Sub lbSignout_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles lbSignout.Click
 'Check iIf the cookies with name PBLOGIN exist on user's machine
        If (Request.Cookies("PBLOGIN") IsNot Nothing) Then
            'Expire the cookie
            Response.Cookies("PBLOGIN").Expires = DateTime.Now.AddDays(-30)
        End If

        'Redirect to the login page
    End Sub
End Class

------------------If you are using C#.Net-------------------------

partial class _Default : System.Web.UI.Page
{
   
    protected void Page_Load(object sender, System.EventArgs e)
    {
        if (!IsPostBack)
        {
            //Check if the browser support cookies
            if (Request.Browser.Cookies)
            {
                //Check if the cookies with name PBLOGIN exist on user's machine
                if (Request.Cookies("PBLOGIN") != null)
                {
                    //Pass the user name and password to the VerifyLogin method
                    this.VerifyLogin(Request.Cookies("PBLOGIN")("UNAME").ToString(), Request.Cookies("PBLOGIN")("UPASS").ToString());
                }
            }
        }
    }
   
    protected void BtLogin_Click(object sender, System.EventArgs e)
    {
        //check if remember me checkbox is checked on login
        if ((this.CbRememberMe.Checked))
        {
            //Check if the browser support cookies
            if ((Request.Browser.Cookies))
            {
                //Check if the cookie with name PBLOGIN exist on user's machine
                if ((Request.Cookies("PBLOGIN") == null))
                {
                    //Create a cookie with expiry of 30 days
                    Response.Cookies("PBLOGIN").Expires = DateTime.Now.AddDays(30);
                    //Write username to the cookie
                    Response.Cookies("PBLOGIN").Item("UNAME") = this.TbUserName.Text;
                    //Write password to the cookie
                    Response.Cookies("PBLOGIN").Item("UPASS") = this.TbPassword.Text;
                }
                //If the cookie already exist then wirte the user name and password on the cookie
                else
                {
                    Response.Cookies("PBLOGIN").Item("UNAME") = this.TbUserName.Text;
                    Response.Cookies("PBLOGIN").Item("UPASS") = this.TbPassword.Text;
                }
            }
        }
       
        this.VerifyLogin(this.TbUserName.Text, this.TbPassword.Text);
    }
   
    protected void VerifyLogin(string UserName, string Password)
    {
        try
        {
             //If login credentials are correct
                  //Redirect to the user page
             //else
                  //prompt user for invalid password
             //end if
        }
        catch (System.Exception ex)
        {
            Response.Write(ex.Message);
        }
    }
   
    protected void lbSignout_Click(object sender, System.EventArgs e)
    {
        //Check iIf the cookies with name PBLOGIN exist on user's machine
        if ((Request.Cookies("PBLOGIN") != null))
        {
            //Expire the cookie
            Response.Cookies("PBLOGIN").Expires = DateTime.Now.AddDays(-30);
        }
       
        //Redirect to the login page
    }

}

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

ASP.NET Community
United States United States
The ASP.NET Wiki was started by Scott Hanselman in February of 2008. The idea is that folks spend a lot of time trolling the blogs, googlinglive-searching for answers to common "How To" questions. There's piles of fantastic community-created and MSFT-created content out there, but if it's not found by a search engine and the right combination of keywords, it's often lost.

The ASP.NET Wiki articles moved to CodeProject in October 2013 and will live on, loved, protected and updated by the community.
Group type: Collaborative Group

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